HOW MANY MPG DOES MY 12 VALVE CUMMINS GET? 24+MPG?

Help my brother! gofund.me/3f5a...
Showing the miles per gallon I get with my truck. I am the slowest driver in my county. I try not to got over 55 mph because that is the sweet spot for fuel efficiency.
Filmed with: Canon VIXIA HF R800 Camcorder
Edited with: Adobe Premiere Pro CC 2019